package chapter02;
import java.util.Scanner;
public class Training09 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
            System.out.println("请输入班级人数");
            int num = sc.nextInt();
            double[] score = new double[num];
            int gt80 = 0;
            int gt70 = 0;
            int gt60 = 0;
            int lt60 = 0;
            double sum = 0;
            for (int i = 0; i < score.length; i++) {
                System.out.println("请输入学号是" +(i + 1) + "学生的成绩：");
                score[i] = sc.nextDouble();
                sum = sum + score[i];
                if (score[i] >=80){
                    gt80++;
                }else if (score[i] >=70){
                    gt70++;
                }else if (score[i] >=60){
                    gt60++;
                }else if (score[i] >=0){
                    lt60++;
                }else {
                    System.out.println("第" +(i + 1) +"成绩格式错误");
                }
            }
            double avg = sum / score.length;
            System.out.println("全班平均成绩为：" + avg);
            System.out.println("成绩大于80分：" + gt80);
            System.out.println("成绩大于70分：" + gt70);
            System.out.println("成绩大于60分：" + gt60);
            System.out.println("成绩不及格人数：" + lt60);
        }
    }
